The short version
Apple Watch Series 11 is the better all-purpose smartwatch; Garmin Venu 4 is the better HRV-and-training instrument. The HRV question is genuinely settled in Garmin’s favour because Apple Watch samples HRV intermittently, including during sleep, rather than averaging the whole night — and the whole night is the steadiest window.
When is Apple Watch the right pick?
If you are in the iPhone ecosystem and want a watch that handles messaging, payments, ECG, fall detection, emergency SOS, fitness rings and a thousand third-party apps — and HRV is a feature you check occasionally — Apple Watch is the right shape. It is the best general-purpose smartwatch on the market.
When is Garmin the right pick?
If training is the reason you are buying — structured workouts, recovery hours, body battery, multi-day continuous HRV — Garmin Venu 4 is the right shape. The up-to-12-day battery, training-load model, and lack of subscription gating are exactly what training-driven users actually use. For HRV specifically, Garmin is the unambiguous winner here.
2026 update
This is the Series 11. In September 2026 Apple launched the Apple Watch Series 12, whose new Health Sensing System samples HRV about 24× more often and adds a Recovery HRV — narrowing much of the HRV gap to Garmin. If you are buying new, see Series 12 vs Garmin Venu 4; the Series 11 remains a good value while discounted.